黄土地层盾构隧道受力监测与荷载作用模式的反演分析  

Mechanical property testing and back analysis of load models of metro shield tunnel lining in loess strata

作　　者：周济民[1] 何川[1] 方勇[1] 谭准[1] 

机构地区：[1]西南交通大学地下工程系,成都610031

出　　处：《岩土力学》2011年第1期165-171,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.50925830);国家973计划(No.2010CB732105);中央高校基本科研业务费专项资金资助(No.2010XS03)

摘　　要：为探明黄土地层中地铁盾构隧道管片衬砌结构与周围土体的相互作用关系,以西安地铁2号线穿越老黄土地层盾构隧道为研究对象,对实际作用于管片衬砌结构的水压力、土压力及主体结构内力(轴力、弯矩)进行现场动态跟踪测试,分析施工过程中盾构机动态掘进及后期稳定后的土-水压力对管片结构受力的影响。结合利用管片内力的现场实测值,采用正交试验设计分析方法,定义优化分析函数,反演分析黄土地层中盾构隧道管片衬砌结构设计荷载的合理计算参数。通过对比分析表明,运用优化后的设计参数得出的计算内力值与实测值在量值与分布上均较为接近,证实了分析方法的可行性、合理性,其成果可供类似工程设计参考。Based on the Xi＇an metro shield tunnel traversing old loess strata, dynamic tracking measurements of water pressure, earth pressure and structure internal force （axial force and bending moment） are carried out to analyze influences of the shield tail serum injection, cylinder thrust force, soil stress relaxation and water pressure on the distributions and varying laws of segment ring. Combining with field test data of internal force, the distribution mode and value of the load pressure on the segment lining in old loess strata are back analyzed by using orthogonal design method and defining target function. Internal force which are calculated by using optimized design parameters are quite close to measured value in magnitude and distribution. The results show that the analysis method proposed is feasible and reasonable; so it can be used for reference of similar projects.

关 键 词：盾构隧道 黄土地层 现场试验 反演分析 正交试验 

分 类 号：TU432[建筑科学—岩土工程]